You think it’s hot in summer now? Well, climate research group Climate Central has put together a report showing just how bad it will get if climate change models are accurate and global warming continues unabated. According to the group, by 2100 unless policy dramatically changes, Phoenix will be as toasty as the hottest city in the Middle Eastern desert is now. Most of the U.S. will start to get a taste of what Texas gets. And even San Francisco will be...uh, warm? Find out what your great-grandchildren most likely will have to bear.